List of devices attached is followed by blank!

1).$ lsusb
2).Find the usb device appeared when you plug in your smartphone. You can use the command above twice to find it.

3).Copy the id of your device to /home/.android/adb_usb.ini

Example :

~$ lsusb

Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub

Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Bus 001 Device 010: ID 2207:0010 <---------------------------------------------------------------This is it!

Bus 002 Device 003: ID 046d:c05a Logitech, Inc. Optical Mouse M90

Bus 002 Device 004: ID 046d:c31d Logitech, Inc.

>>>Add Ox2207 to adb_usb.ini.

4).adb kill-server

adb start server

5).Try "adb devices" now, miracle happens.

Reference:
http://danaquentin.lofter.com/post/dd8db_5de3ad http://stackoverflow.com/questions/21236049/list-of-devices-attached-is-empty-on-ubuntu-12-04